Method for closed loop characterization

Abstract

A method for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein the first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the method including (a) selecting a first point in the first space; (b) applying the transformation to the first point, thus obtaining a target value in the second device dependent colorant space; and (c) correcting the target value, thus modifying the transformation, wherein the correction of the target value is based on a measured value of a color patch, reproduced on the second color reproduction device for a second point in the second device dependent colorant space, wherein the second point is (i) a point around the target value and different from the target value, or (ii) the target value.

1 . A method for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein said first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the method comprising: 
 selecting a first point in said first space;    applying said transformation to said first point, thus obtaining a target value in said second device dependent colorant space; and    correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is selected from the group of (i) a point around said target value and different from said target value and (ii) said target value.    
     
     
         2 . The method according to  claim 1  further comprising using said second point and said measured value in constructing a local model of said second color reproduction device around said target value.  
     
     
         3 . The method according to  claim 1  further comprising using said transformation in making a dot for dot proof.  
     
     
         4 . The method according to  claim 2  further comprising using said transformation in making a dot for dot proof.  
     
     
         5 . The method according to  claim 1  wherein said second color reproduction device is a computer display.  
     
     
         6 . The method according to  claim 1  wherein said second color reproduction device is an inkjet proofing device.  
     
     
         7 . The method according to  claim 6  further comprising: 
 printing said color patch on said ink jet proofing device; and    measuring said value of said color patch on a measurement device that is mechanically coupled to said ink jet proofing device.    
     
     
         8 . A method for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein said first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the method comprising: 
 selecting a first point in said first space;    applying said transformation to said first point, thus obtaining a target value in said second device dependent colorant space; and    correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is a point around said target value and different from said target value.    
     
     
         9 . The method according to  claim 8  further comprising using said second point and said measured value in constructing a local model of said second color reproduction device around said target value.  
     
     
         10 . The method according to  claim 8  further comprising using said transformation in making a dot for dot proof.  
     
     
         11 . The method according to  claim 9  further comprising using said target value and another measured value of another color patch in constructing said local model, wherein said other color patch is reproduced on said second color reproduction device for a third point, wherein said third point is said target value.  
     
     
         12 . The method according to  claim 11  further comprising using said transformation in making a dot for dot proof.  
     
     
         13 . A method for modifying a transformation from a first device dependent colorant space of a first color reproduction device to a second device dependent colorant space of a second color reproduction device, the method comprising: 
 selecting a first point in said first device dependent colorant space;    applying said transformation to said first device dependent colorant space, thus obtaining a target value in said second device dependent colorant space; and    correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is a point around said target value and different from said target value.    
     
     
         14 . The method according to  claim 13  further comprising using said second point and said measured value in constructing a local model of said second color reproduction device around said target value.  
     
     
         15 . The method according to  claim 13  further comprising using said transformation in making a dot for dot proof.  
     
     
         16 . The method according to  claim 14  further comprising using said target value and another measured value of another color patch in constructing said local model, wherein said other color patch is reproduced on said second color reproduction device for a third point, wherein said third point is said target value.  
     
     
         17 . The method according to  claim 16  further comprising using said transformation in making a dot for dot proof.  
     
     
         18 . The method according to  claim 13  wherein said second color reproduction device is a computer display.  
     
     
         19 . The method according to  claim 13  wherein said second color reproduction device is an inkjet proofing device.  
     
     
         20 . The method according to  claim 19  further comprising: 
 printing said color patch on said ink jet proofing device; and    measuring said value of said color patch on a measurement device that is mechanically coupled to said ink jet proofing device.    
     
     
         21 . A computer program product for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein said first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the computer program product comprising: 
 first program instructions for selecting a first point in said first space;    second program instructions for applying said transformation to said first point, thus obtaining a target value in said second device dependent colorant space; and    third program instructions for correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is selected from the group of (i) a point around said target value and different from said target value and (ii) said target value.    
     
     
         22 . The computer program product according to  claim 21  further comprising a computer readable medium wherein said first, second and third program instructions are recorded on said medium.  
     
     
         23 . The computer program product according to  claim 21  further comprising fourth program instructions for using said transformation in making a dot for dot proof.  
     
     
         24 . The computer program product according to  claim 21  further comprising fifth program instructions for using said second point and said measured value in constructing a local model of said second color reproduction device around said target value.  
     
     
         25 . The computer program product according to  claim 24  further comprising sixth program instructions for using said transformation in making a dot for dot proof.  
     
     
         26 . A computer program product for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein said first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the computer program product comprising: 
 first program instructions for selecting a first point in said first space;    second program instructions for applying said transformation to said first point, thus obtaining a target value in said second device dependent colorant space; and    third program instructions for correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is a point around said target value and different from said target value.    
     
     
         27 . The computer program product according to  claim 26  further comprising a computer readable medium wherein said first, second and third program instructions are recorded on said medium.  
     
     
         28 . A system for modifying a transformation from a first space to a second device dependent colorant space of a second color reproduction device, wherein said first space is selected from the group of a first device dependent colorant space of a first color reproduction device and a first device independent color space, the system comprising: 
 a selector for selecting a first point in said first space;    an applicator for applying said transformation to said first point, thus obtaining a target value in said second device dependent colorant space; and    a correction module for correcting said target value, thus modifying said transformation, wherein said correction of said target value is based on a measured value of a color patch, reproduced on said second color reproduction device for a second point in said second device dependent colorant space, wherein said second point is selected from the group of (i) a point around said target value and different from said target value and (ii) said target value.